This may have been one of the single best “Chuck” episodes ever, and was (IMHO) definitely the best episode this season.
The most obvious place to start would be the quality of the guest stars. Scott Bakula as Chuck’s addle pated father with delusions of grandeur (and an opportunity to say, “Oh boy,” just like he used to say on NBC a long time ago)? Or how about Chevy Chase as an evil clone of Bill Gates? The only downside of having such big stars in guest roles is that it I kept seeing them as their previous roles.